Document of bibliographic reference 128834

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Predicting acute zinc toxicity for Daphnia magna as a function of key water chemistry characteristics: Development and validation of a biotic ligand model

Abstract

The individual effect of different major cations (Ca²⁺, Mg²⁺, Na⁺, K⁺, and H⁺) on the acute toxicity of zinc to the waterflea Daphnia magna was investigated. The 48-h median effective concentration (EC50) in the baseline test medium (i.e., a standard medium with very low ion concentrations) was about 6 μM (Zn²⁺). An increase of Ca²⁺ (from 0.25 mM to 3 mM), Mg²⁺ (from 0.25 mM to 2 mM), and Na⁺ activity (from 0.077 mM to 13 mM) reduced zinc toxicity by a factor of 6.3, 2.1, and 3.1, respectively. No further toxicity reduction was observed when Ca²⁺ and Mg²⁺ activities exceeded 3.0 and 2.0 mM, respectively. Both K⁺ and H⁺ did not significantly alter zinc toxicity (expressed as Zn²⁺ activity). From these data, conditional stability constants for Ca²⁺ (log K = 3.24), Mg²⁺ (log K = 2.97), Na⁺ (log K = 2.16), and Zn²⁺ (log K = 5.31) were derived and incorporated into a biotic ligand model (BLM) predicting acute zinc toxicity to D. magna in surface waters with different water quality characteristics. Validation of the developed BLM using 17 media with different pH, hardness, and dissolved organic carbon (DOC) content resulted in a significant correlation coefficient (R² = 0.76) between predicted and observed 48-h EC50. Eighty-eight percent of the predictions were within a factor of 1.3 of the observed 48-h EC50.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000175874300028

Bibliographic citation

Heijerick, D.G.; De Schamphelaere, K.A.C.; Janssen, C.R. (2002). Predicting acute zinc toxicity for Daphnia magna as a function of key water chemistry characteristics: Development and validation of a biotic ligand model. Environ. Toxicol. Chem. 21(6): 1309-1315. https://dx.doi.org/10.1897/1551-5028(2002)021<1309:PAZTFD>2.0.CO;2

Topic

Fresh water

Is peer reviewed

true